I have a cub cadet 18 m self propelled lawn mower,when i start it it runs a few seconds and shuts off,i cleaned the carb,changed the plug and air filter with no results,wierd thing nis when i get it started if i tilt it back to me front wheels off the ground it will run with a slight off idle,when i set it down on on all four wheels it shuts off,any suggestions would be appreciated
